Core shaping tool



Oct. 1962 c. T. LARSEN ETAL 3,060,994

CORE SHAPING TOOL 4 Filed May 2, 1960 INVENTORS.

Charles 7." Larsen Anfhony L. Mal/nowski BY ATTORNEYS United States Patent 50 3,060,994 CORE SHAPING TOOL Charles T. Larsen, Denver, and Anthony L. Malinowski, Littleton, Colo., assignors to The Denver Publishing Company, Denver, Colo., a corporation of Colorado Filed May 2, 1960, Ser. No. 26,287 1 Claim. (Cl. 15379) This invention is directed to a tool for rounding deformed cores in rolls of newsprint.

The cores upon which newsprint is rolled are not sufiiciently strong to withstand the hard bumps or drops to which the rolls are subjected in shipment, and the cores become deformed and out-of-round. In this condition, it is virtually impossible to mount the rolls in the presses for printing. The cores are mainly tubular cardboard with short, pressed steel caps or inserts for mating with support mandrels on the presses. The newsprint wound on these cores have a high degree of spongyness which has made rounding of smashed inserts extremely diflicult.

However, we have invented a simple, inexpensive, easy to use device which overcomes the spongy characteristics of the newsprint roll and rounds the metal core insert of such newsprint rolls. The device is capable of exerting a great, even pressure around a substantial portion of the internal surface of the metal core inserts to thereby round them for mounting on the printing presses.

Further, our device is of such a construction that it may easily be initially inserted in a squashed and deformed core without difficulty.

It is therefore among the objects and advantages of our invention to provide a simple, easily manufactured and inexpensive tool capable of use by substantially unskilled laborers to round deformed cores in rolls of newsprint.

It is a further object of our invention to provide a device for rounding deformed newsprint cores against the spongy nature of the newsprint.

Further objects and advantages will become obvious to those skilled in the art from a study of the appended exemplary drawings and the description set forth hereafter.

In the drawings:

FIG. 1 is a side view, in partial section, of a core rounding tool according to our invention;

FIG. 2 is a side view, in partial section, of a roll of newsprint with the device of FIG. 1 in initial position;

FIG. 3 is a section through 3-3 of FIG. 2;

FIG. 4 is a section through 4-4 of FIG. 1;

FIG. 5 is a section through 55 of FIG. 1; and

FIG. 6 is an end view of the device of FIG. 1 in the expanded position.

Before discussing the invention and drawings in detail, we wish it understood that the design herein shown and described is merely exemplary of one manner of practicing our invention and we do not desire to be limited thereto, but rather by the scope of the appended claim set forth hereafter.

Essentially, our invention consists of a first member 10 which is externally threaded at one end 11 and of an enlarged configuration at its opposite end 12 with diverging planar surfaces 12a and 12b. A pair of pressure plates 13 and 14 are mounted on the member 10 and encompass a substantial portion of the enlarged .end 12. The members 13 and 14 have a recessed configuration which conforms in taper and shape to the enlarged end 12, including opposed planar surfaces 13a and 14a. Referring for the moment to FIG. 4, the internal radial configuration of the members 13 and 14 is more clearly shown encompassing a portion of the enlarged end 12. Also, FIG. 4 shows a pair of resilient members 15 and 3,060,994 Patented Oct. 30., 1962 ice 16 which may be springs or the like to maintain the outer ends of the members 13 and 14 in position around the member 10, while a resilient member or spring 20 maintains the other end of members around member 10. The outer end 11 of the member 10 is threaded and a thrust bearing 17 is mounted thereon and held between a pair of washers or pressure plates 18 and 19. There is an arcuate recess or groove around the peripheral surfaces of the members 13 and 14 for holding the retaining spring 20 which extends around both parts. An internally threaded member 21, which may be a nut or the like, is mounted on the threaded end 11 of the member 10 and arranged to bear against the washer portion 19 of the thrust bearing 17.

FIG. 2 illustrates a roll of newsprint, generally indicated by reference character 30, which is wound on a tubular core 31 therein, and has a pressed steel female cap or insert 32 at each end of the core. One end of the core has been broken to show a tool according to our invention inserted in one of the female inserts 32 as the device would be in initial position. Referring now to FIGS. 4 and 6, FIG. 4 shows the outside configuration of the device in closed position. The outside configuration of the closed device is generally of an oval configuration. The enlarged section 12 of the member 10 is positioned such that the members 13 and 14 substantially contact each other along the surfaces 33 and 34, respectively. After the device is placed in position, the nut 21 is pulled up on the washer 19 of the thrust bearing 17. This threading action causes the enlarged end 12 to slide through the complementary recesses in the members 13 and 14, with surfaces 12a and 12b wedging against surfaces 13a and 14a respectively, thereby forcing members 13 and 14 to move apart. FIG. 6 shows the device in expanded position after the core and insert 32 have been rounded by the separation of members 13 and 14. Because of the novel design of the member 10 and the gradual taper through the enlarged end 12, the surfaces 12a and 12b are equal and opposed lateral bearing surfaces which contact surfaces 13a and 18a through a substantial portion of the internally tapered complementary recessed portions of the members 13 and 14. Because of these large bearing surfaces between the enlarged end 12 of the member 10 and the irregular cylinder portions 13 and 14, there is a uniform radial movement of the members through a series of substantially horizontal but parallel planes, thereby providing a uniform pressure against a substantial portion of the internal surface of the inserts 32. The washer 18 of the thrust bearing 17 serves as a bearing means against which the irregular cylinder portions 13 and 14 will radially slide as they move outward against a deformed insert 32.

FIG. 3 is a section through 33 of the device of FIG. 1 illustrating configuration of the insert 32 in deformed condition. It will be seen that the irregular cylindrical shape of the portions 13 and 14 as they are when the device is in its closed position, allows each insertion into such a deformed oval configuration. FIG. 5 is illustrative of the configuration of the other ends of the members 13 and 14 encompassing the cylindrical threaded end of the member 10.

It is anticipated that other than the generally rectangular shape for the end 12 may be used within the scope of our invention. However, we have found that the rectangular configuration and the internal rectangular configuration of the recessed portions of the members '13 and 14 provides excellent bearing surfaces for the application of uniform pressure against the internal surfaces of the recesses in the members 13 and 14, thereby causing the desirable even radial movement of those portions. This permits successful operation of the device in successfully overcoming the previously referred to spongy and elastic character of the newsprint against which the deformed inserts must be moved.

What we desire to be protected by Letters Patent is A newspaper core rounding tool adapted to be placed in a deformed mandrel insert in a roll of newsprint core comprising:

(1) :an inner member having one threaded cylindrical end and the other end tapering along opposed planar surfaces a substantial distance from a point intermediate the ends of the member, said taper progressively increasing in dimension to the tapers largest dimension at the end of the member opposite the said threaded end;

(2) two substantially identical opposed outer mem 'bers each having a recess characterized by a sloped planar surface complementary to one of the sloped surfaces of the inner member and arranged to seat on p the inner members complementary planar surface;

(3) said outer members being mounted on opposed sides of said inner member and arranged to slide on the opposed planar surfaces of said inner member to move toward and away from each other;

(4) the outside surface of the outer members being smooth and ovid in adjacent relation;

(5) resilient means for holding the outer members in encompassing relation with said inner member;

. 4 (6) a thrust bearing assembly mounted on said threaded end inclusive of a first pressure plate bearing against the adjacent ends of said outer members, a thrust bearing mounted on said cylindrical end bearing against said first pressure plate for allowing relative rotation between said first plate and a second pressure plate mounted against said thrust bearing, and; (7) a nut threadedly mounted on said cylindrical mem ber bearing against said second pressure plate; whereby when the nut is moved against the second pressure plate said nut and second pressure plate rotate against the thrust bearing and the inner memher is drawn between the outer members along the planar surfaces of the recess of the outer members moving the outer members laterally outwardly from each other with their outer surfaces substantially parallel to the lengthwise axis of the inner member.

References Cited in the file of this patent UNITED STATES PATENTS 1,326,195 Hasty Dec. 30, 1919 1,476,983 King Dec. 11, 1923 1,610,796 King Dec. 14, 1926 1,753,005 Grady Apr. 1, 1930 1,922,716 Robinett Aug. 15, 1933 FOREIGN PATENTS 2,761 Great Britain 1876 

